Brush-holder.



No. 862,951. PATENTED AUG. 13, 1907.

W. L. WATERS. BRUSH HOLDER.

APPLICATION FILED 13110.5, 1904.

Inv EnTur i William Ll'VaTers 6 92% A fi// 9 m m/ I RBBH A No. 862,951.

and the brush holder. and consists of a plate 18 for engaging the top surface of UNITED STATES PATENT orrron.

WILLIAM L. WATERS, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO NATIONAL BRAKES: ELECTRIC COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

BRUSH-HOLDER. f

Specification of Letters Patent.

mama Aug. 18, 1907.

To all whom it may concern:

Be it known that 1, WILLIAM L. WATERS, a subject of the King of England, and residing at Milwaukee, in

the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Brush-Holders, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification. I

My invention relates to brush holders for electrical machinery, and its object is to provide various improved details of construction and arrangement of the brushes and springs therefor, and of the pig tails connecting the brushes with the brush-holders.

My invention will be best understood, with reference to the accompanying drawings in which Figure 1 is a plan view of the brush holder and supporting parts. Fig. 2 is a side elevation of a brush holder secured to a supporting frame. Fig.3 shows the brush 20 an end view of Fig. 4 showing the top of the spring in engagement therewith.

The brush holder frame consists of a metallic shell 1' having side walls 2 and 3 connected at the front end by the wall l. The rear ends of the sidewalls form into a clamping frame 5 having adjustableiepgagemcnt with the brush holder supporting frame 6. The side walls 2 and 3 have outward extensions 7 and 8 which form the guideways 9 and 10 for tne brush 11; Walls 12 and 13 extend between the sides 2 and 3 at the lower half thereof, an form a chamber 14 which incioses the lower end of the brush, and which is a continuation of the guideways 9 and 10. The brush holder is adjusted on the supporting frame 6 so that the brush'extends a slight distance below the chamber 14 and into engagement with the commutator 15, as shown in Fig. 3.

To maintain the brush in contact with the commutator, I provide a cap frame 16 engaging the brush and helical springs 17 17 disposed between the cap frame This cap frame may be integral the brush, being secured thereto preferably by screws 18, and flanges 19 and 20 extending downwardly from the plate 18 to form at, with the plate which engages 24 and 25 .are studs 27 and 28 of insulating material secured between the side walls 2 and 3 of the brush holder, these studs being secured by means of pins 29 which pass through the studs and through the side walls. The helical spring 17 17 extend between the extensions of the cap plate and the studs. The lower ends of the springs A engage in circumferential grooves 32 on the insulating studs, while the springs at their upper ends are inserted in the corresponding slots 24 and 25. As theedges of these slots are beveled, as before described, the springs may-be engaged between any of its turns, and their tension adjusted to provide any desired pressure of the brush against the commutator.

To allow the springs to be easily meleil into different adjustments buttons 33 are provided, which may be of metal, but which are preferably of insulating material. Each button consists of a head 34 and a stem 35 threaded to receive the upper end of the springs. Thus to' adjust the tension of the springs they may readily be slid from the slots in the cap frame and extended or re leased and inserted in the slots at a different position.

Should a spring become broken, it can easily be replaced by the removal thereof from the cap frame slot and by the withdrawal of the corresponding insulating stud pin and can thus very quickly be replaced. The insulating studs serve also to insulate the springs from the brush holder to prevent any current passing through 1 them.

To afford a connection for a pig tail' 36 with the cap frame, a binding post 37 is secured to the top of the plate 18, the pig tail ends passing through the opening 38, to be clamped therein by a set screw 39. A binding post 40 secured to the top of the clamping member of the brush holder will serve in like manner to secure the other end of the pig tail in good mechanical and electrical contact with the brush holder.

I thus provide a brush holder of very simple construction and very efiicient means for holding the brush in position, and for providing the necessary pressure thereon. By placing a spring at either side of the brush, as shown, their'tension may be relatively adjusted to procities the proper pressure on-the brush, and at the same I time to prevent chattering thereof. Boththe pig tails and the springs, due to their arrangement, are very readily removed and replaced. v I do not wish to be limited to the exact construction and arrangement of the parts herein shown, as many I modifications maybe made without departing from the spirit of invention.

I claim as new, and desire to secure by Letters Patent:

In a brush holder. the chmblnatlon of a supporting frame having side walls 2 and 3, there being a brush channel 14 extending between said walls, a brush in said chantensions 21 and 22 from said cap frame, there being a slot extending inwardly from the end of each of said expensions; a pin connecting the side walls below each. extension. 51 bushing of insulating material' on each pin, a helical spring at each side of the brush, the lower end of each spring engkglng about the corresponding bushing, the up per end of each spring being adapted for engagement between any at its turns within said slot, whereby the tension of said springs is adjustable, buttons having threaded engagement with the upper end of the springs, the edges of the slots being beveled whereby they may be readily inserted between any of the spring turns. a binding post on said can plate,'a binding post on the supporting plate, and a pig tail connector having its ends secured in said binding posts.

In witness whereof, I hereunto subscribe my name this first day of December A, D., 1904.

WILLIAM L. WATERS.

Witnesses:

Jonx Hnmzn, N. 8. MAY. 

